alum mixture...1/2 lbs. alum. sulfate, 1/2 lbs. salt (not table), H2O to make a paste, stir good, let sit 60 minutes, coat it on thick to a tacked out skin feathers down. cover w/ a plastic bag for two days. scrap off and repeat for security (more mix and two more days), take off plasic and let dry. Scrape off and your done. Borax will keep it from rotting, but thismix will tan it. dpgratz